Question: What is at the grave of the son of Sancha of Castile, Queen of Navarre?
Paraphrase: WHICH IS THE GRAVE OF THE SONE OF SANCHA OF CASTILE QUEEN OF NAVARRA
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q939696 wdt:P25 ?X . ?X wdt:P119 ?answer}
Answer: Royal Pantheon of Santiago de Compostela